Gday all,
Having a few dramas with my XHXR6 at the moment, have had some pacies fitted recently, and have noticed following the fit that my fuel consumption has increased (pretty greatly). Before I used to get around 500-540 ks to the tank (Ultimate 98 only), where now Im lucky to get between 400-440. My driving style hasnt changed, nor have the conditions.
I assume that after fitting extractors that I would have had better fuel economy. Do you think its possible that while they fitted my headers theyve buggered the 02 sensor or is the problem elsewhere.
The ute is always in immaculate condition with clean filters, plugs, injectors so forth and always serviced, just now my fuel consumption has increased - wallet starting to bleed a bit more
Any ideas?

Shouldn't of affected the oxy sensor unless they stuffed with it. Another cause could be a leak where the extractors fit to the head, even though its a leak it also pulls in fresh air giving the oxy sensor a lean reading, so the ecu puts in more fuel.

When fitting almost an extractors, the O2 sensor is moved further back down the pipes than where it normally sits.

Like any sensor they generally die over time and not be as responsive to a/f changes.

So now what you have an old s**t O2 sensor, that didnt work properly in the first place, moved further back down the pipes (and most likely only looking at 3 cylinders) so its bound to not do as good a job anymore.

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